Internal wrench



Jul 15 1924.

III

. MlCK TERNAL WRENCH Filed June 14 1923 INVENTOR. j 67%;! Illa/t,

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Patented July 15, 1924 was UNITED STATES PATE 1,501,889 NT OFF ICE.

GLAUD J'. MICK, OF INDIANAPOLIS, INDIANA, ASSIG-NOR TO LEADER SPECIALTY(10., ,ING OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

Application filed June 14, 1923. Serial No. 645,252.

To all whom it may concern..-

.Be it known that I, CLAUD J. MICK, a citizen of the United States,residing at Indianapolis, in the county of Marion and State ofIndiana,have invented a new and useful Internal lVrench, of which thefollowing is a specification.

It is the object of my invention to provide an adjustable internalwrench, which will grip the inner surfaces of articles of various sizes,and especially pipes and pipe fittings and other round articles, andprovides large gripping surfaces so that it will not strain the pipe orother article at the points of contact. Such a wrench is very desirablefor use in connection with a fitting whose exterior surface is such thatit may not be conveniently gripped or may be injured by the ordinarytype of pipe wrench. Such fittings as short nipples Whose exteriorsurfaces are substantially entirely covered by screw threads, andexteriorly threaded flanged bushings, are fittings which may beconveniently handled by my internal wrench.

The accompanying drawing illustrates my invention: Fig.1 is aperspective view showing my internal wrench being used to grip a flangedbushing; and Fig. 2 is a plan on a slightly larger scale than Fig. 1.

My wrench comprises a threaded rod 10, two jaws 12 and 13 mountedthereon, and preferably a cross-rod handle 14 for turning the rod 10.The two jaws are so mounted on the rod 10 that they may be movedrelatively to each other longitudinally of the rod by the action of thescrew threads when the rod is rotated relatively to one of the jaws.This provides both for adjustment to articles of different size, and forsetting the wrench tight on the article. This adj ustment mayconveniently be accomplished by mounting one jaw, the jaw 13 as shown inthe drawing, on the screw threads 11 of the rod 10, and the other jaw 12on the end of such rod so that it is restrained from any longitudinalmovement relatively thereto. With such arrangement, the jaw 12 ispreferably pivotally mounted on the rod 10, to permit it to be swunginto the same longitudinal plane as the jaw 11. The pivotal mounting ofthe 'jaw 12 may be accomplished in any convenient manner. In the formshown in the drawings the rod 10 has at its end, a p01tion15 which isreduced in asse s? t his a s a l ai its 1' w is turned as desireINTERNAL WRENCH.

provided with a countersunk hole of suitable size to fit the portion 15.The jaw 12-is placed in position on the portion 15, and the end of therod is then enlarged, as by peening, to fill the countersunk port-ion ofthe hole and hold the jaw 1.2 in place against the shoulder on the endof the rod 10 while still permitting it to turn. The exterior faces ofthe jaws, or those faces which grip the pipe, are preferably corrugatedconvex cylindrical surfaces, of rather large size, so that they mayeffectively grip the in terior surface of the pipe over considerableareas and thus avoid straining the pipe.

In operation, the rod 10 is turned relatively to the jaw 13 until thetwo jaws 12 and 13 are close enough together to enter the pipe orfitting it is desired to grip. After the jaws are inserted in the pipe,the rod 10 is rotated by means of the handle 14, and thereby the jaws 12and 13 are moved apart by the action of the screw threads 11 until afirm grip is secured on the interior surface of the pipe, which may thenbe I claim as my invention:

1. An internal pipe wrench, comprising a screw-threaded rod, a jawmounted on the screw threads of said rod, and a second jaw pivotallymounted on said rod, the exterior surfaces of said jaws being corrugatedto grip internal surfaces.

2. An. internal pipe wrench, comprising a screw-threaded rod, two jawsrotatably mounted on said rod and arranged to be moved relatively toeach other longitudinally of the rod by the action of the screw threadswhen the rod is rotated relatively to one of said jaws, the exteriorsurfaces of said jaws being corrugated to grip internal surfaces.

3. An internal pipe wrench, comprising a screw-threaded rod, two jawsrotatably mounted on said rod and having their outer surfaces as thework-engaging surfaces, said jaws being arranged to be moved relativelyto each other longitudinally of the rod by the action of the screwthreads when the rod is rotated relatively to one of said aws.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 12th day of June, A, D. one thousand nine hund ed. andtwen y three GL UD. J, "MIC

